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Basher said..
Reading this thread - and the answers - is very revealing. It just shows how different people look at things differently, depending on what sort of gear they sail, and more importantly, depending on their ability level.
If you are just learning then early planing might be helped by shifting the rig forwards if that allows you to stand further forwards on a big board to help level it.
But with modern shortboard gear, we generally move the mast foot back to help with early planing, and we keep the board level by leaning forwards.
Moving the mast foot back brings it closer to the fin and sets the rig more upright. Levelling the board is best done by shifting sailor weight, and by moving the footsteps if need be.
Beginners also find having a bigger fin is helpful to get going and to avoid spinout, but an oversize fin also slows you down and can make the board a pig to gybe.
These differences in turn make it almost pointless to match board volume and sail size to knots of wind strength.
We don't actually know what windspeed we sail in because that is rarely measured on the water - and the wind reading on the beach is often an under-estimate.
Better to learn to read your local conditions, and to change sail size up or down when it doesn't feel right.
The starting point with sail size is to look at what others are using - and to know whether the forecast says the wind will increase or if it will decrease.
Thats a good point. Bluefusionman says he is an intermediate, I assume thats planing in the harness & straps ok, water start, but not planing carve gybes. Past the beginner stage. 70kg, uses a Naish 130 with 5.5m wave to 7.1 Freeride and used the 8m for the first time.
For an 8m, I would have the mast foot further back than a 7.1m on the board, but for an intermediate using an 8m Cheetah for the first time it would feel heavier (especially if it was pre 2020). Keeping the mast foot in the same place as the 7.1m might be better, to start with anyway.
I wouldnt move the straps though, and when gybing large boards with 8m sail, a 44cm fin woudn't be the first thing to hold someone back. Using too small a fin and you wont have the speed to enter the gybe,, especially if you have moved the straps forward and increased the waterline when planing. In light winds and 8m, the first thing to get right is the speed into the gybe. Then what hampers you is getting wide board to turn (back foot needs to be on the inside rail), and flipping an 8m sail.
If the board is like a Titan 130, thats 84cm wide and 240cm long, so easy to sail. It should cope with 8m fine. 44cm isnt overly big for the board. If its a much older board, probably a lot narrower. The early planing technique would be slightly different. Most modern wider boards need bearing off a bit to get going.
People's idea of wind speeds varies a lot. Where I sail there is an anemometer on a pole on a hut on a platform in the harbour and its about 6m out of the water so the wind speed at head height is about 10% less than what it says. Portland Harbour, the anemometer is on a pole on a building on the harbour wall, and at least 10m out of the water. So I reckon that is about 20% more than at head height. But others take what the meters give as read.